NDLI: Structural, dielectric and electrical properties of lithium silicate ceramics: a comparative study

Content Provider	Springer Nature Link
Author	Prasad, Abhijit Basu, Amitabha
Copyright Year	2012
Abstract	Lithium silicate (LS) ceramics were prepared via a solid-state reaction technique. Two ceramics with different molar ratios of Li$_{2}$CO$_{3}$/SiO$_{2}$ (1:1 and 1:2) were prepared for dielectric studies. X-ray diffraction pattern showed that Li$_{2}$CO$_{3}$/SiO$_{2}$ (1:1) ceramic is obtained as single phase composition whereas Li$_{2}$CO$_{3}$/SiO$_{2}$ (1:2) ceramic exhibit a multiphase structure with Li$_{2}$SiO$_{3}$ as a major phase. Microstructural analysis shows that the compounds have well defined grains separated by grain boundaries. Dielectric and electrical properties of the samples were studied in a wide temperature (30–400 °C) and frequency ranges (100 Hz–5 MHz). From the dielectric studies, we can prescribe Li$_{2}$CO$_{3}$/SiO$_{2}$ (1:2) ceramic as a good dielectric material since it possesses low dielectric loss. Detailed analysis of the impedance data suggests that the conduction of Li$_{2}$CO$_{3}$/SiO$_{2}$ (1:2) ceramic is mainly due to the bulk effects whereas the complex impedance plots of Li$_{2}$CO$_{3}$/SiO$_{2}$ (1:1) ceramic suggests the presence of both bulk as well as grain boundary contributions. The bulk resistance of the samples has been observed to decrease with rise in temperature showing a typical negative temperature coefficient of resistance behavior. The low activation energies of the samples suggest the presence of singly ionized oxygen vacancies in the conduction process.
Starting Page	1855
Ending Page	1862
Page Count	8
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	24
Issue Number	6
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2012-12-07
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical and Electronic Materials Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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